KazuhitoT opened a new pull request #7224: Add ROUND function in druid-sql. URL: https://github.com/apache/incubator-druid/pull/7224 Add `ROUND` function in druid-sql. issue: https://github.com/apache/incubator-druid/issues/5644 - It can be used for doubles (return `double`) and integers (return `long`). - Both `ROUND(x)` and `ROUND(x, y)` works like `TRUNC(x, y)`. - This is implemented by replacing `Math.round()` with `Bigdecimal.setScale()` as following: ```java protected ExprEval eval(ExprEval param, ExprEval scale) { if (param.type() == ExprType.LONG) { Long value = BigDecimal.valueOf(param.asLong()).setScale(scale.asInt(), RoundingMode.HALF_UP).longValue(); return ExprEval.of(value); } else { double value = BigDecimal.valueOf(param.asDouble()).setScale(scale.asInt(), RoundingMode.HALF_UP).doubleValue(); return ExprEval.of(value); } } ```
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